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strace: support more stuff

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This commit is contained in:
K. Lange 2023-04-18 19:40:32 +09:00
parent a2c5a4ab87
commit ee797d37fc
1 changed files with 26 additions and 1 deletions
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27
apps/strace.c
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@ -20,6 +20,7 @@
#include <sys/sysfunc.h>
#include <sys/utsname.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <syscall_nums.h>
static FILE * logfile;
@ -528,6 +529,24 @@ static void buffer_arg(pid_t pid, uintptr_t buffer, ssize_t count) {
}
}
static void msghdr_arg(pid_t pid, uintptr_t msghdr) {
struct msghdr data = {0};
if (data_read_bytes(pid, msghdr, (char*)&data, sizeof(struct msghdr))) {
fprintf(logfile, "(?)");
} else {
fprintf(logfile, "{msg_name=%#zx,msg_iovlen=%zu,msg_iov[0]=", (uintptr_t)data.msg_name, data.msg_iovlen);
if (data.msg_iovlen > 0) {
struct iovec iodata = {0};
if (data_read_bytes(pid, (uintptr_t)data.msg_iov, (char*)&iodata, sizeof(struct iovec))) {
fprintf(logfile,"?");
} else {
fprintf(logfile,"{iov_base=%#zx,iov_len=%zu}", (uintptr_t)iodata.iov_base, iodata.iov_len);
}
}
fprintf(logfile,"}");
}
}
static void print_error(int err) {
const char * name = (err >= 0 && (size_t)err < (sizeof(errno_names) / sizeof(*errno_names))) ? errno_names[err] : NULL;
if (name) {
@ -539,7 +558,7 @@ static void print_error(int err) {
static void maybe_errno(struct regs * r) {
fprintf(logfile, ") = %ld", syscall_result(r));
if ((intptr_t)syscall_result(r) < 0) print_error(syscall_result(r));
if ((intptr_t)syscall_result(r) < 0) print_error(-syscall_result(r));
fprintf(logfile, "\n");
}
@ -773,6 +792,12 @@ static void handle_syscall(pid_t pid, struct regs * r) {
/* two output args */
break;
case SYS_SIGACTION: break;
case SYS_RECV:
case SYS_SEND:
fd_arg(pid, syscall_arg1(r)); COMMA;
msghdr_arg(pid, syscall_arg2(r)); COMMA;
int_arg(syscall_arg3(r));
break;
/* These have no arguments: */
case SYS_YIELD:
case SYS_FORK: